Minimal Weierstrass equation
Minimal Weierstrass equation
Simplified equation
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\(y^2=x^3-7788x+31088\)
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(homogenize, simplify) |
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\(y^2z=x^3-7788xz^2+31088z^3\)
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(dehomogenize, simplify) |
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\(y^2=x^3-7788x+31088\)
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(homogenize, minimize) |
Mordell-Weil group structure
\(\Z \oplus \Z \oplus \Z/{2}\Z\)
Mordell-Weil generators
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| $(-2, 216)$ | $1.0271278897720863020582406299$ | $\infty$ |
| $(-56, 540)$ | $1.3233929148320598437170559895$ | $\infty$ |
| $(4, 0)$ | $0$ | $2$ |
Integral points
\((-82,\pm 344)\), \((-56,\pm 540)\), \((-2,\pm 216)\), \( \left(4, 0\right) \), \((94,\pm 360)\), \((133,\pm 1161)\), \((254,\pm 3800)\), \((328,\pm 5724)\), \((488,\pm 10604)\), \((1294,\pm 46440)\)
Invariants
| Conductor: | $N$ | = | \( 123840 \) | = | $2^{6} \cdot 3^{2} \cdot 5 \cdot 43$ |
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| Discriminant: | $\Delta$ | = | $29813855846400$ | = | $2^{15} \cdot 3^{9} \cdot 5^{2} \cdot 43^{2} $ |
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| j-invariant: | $j$ | = | \( \frac{2186875592}{1248075} \) | = | $2^{3} \cdot 3^{-3} \cdot 5^{-2} \cdot 11^{3} \cdot 43^{-2} \cdot 59^{3}$ |
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| Endomorphism ring: | $\mathrm{End}(E)$ | = | $\Z$ | |||
| Geometric endomorphism ring: | $\mathrm{End}(E_{\overline{\Q}})$ | = | \(\Z\) (no potential complex multiplication) |
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| Sato-Tate group: | $\mathrm{ST}(E)$ | = | $\mathrm{SU}(2)$ | |||
| Faltings height: | $h_{\mathrm{Faltings}}$ | ≈ | $1.2752811942803725468681048385$ |
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| Stable Faltings height: | $h_{\mathrm{stable}}$ | ≈ | $-0.14045892575361393560105793178$ |
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| $abc$ quality: | $Q$ | ≈ | $0.9159106194340305$ | |||
| Szpiro ratio: | $\sigma_{m}$ | ≈ | $3.2826345990335692$ | |||
BSD invariants
| Analytic rank: | $r_{\mathrm{an}}$ | = | $ 2$ |
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| Mordell-Weil rank: | $r$ | = | $ 2$ |
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| Regulator: | $\mathrm{Reg}(E/\Q)$ | ≈ | $1.1300069923343561813070541379$ |
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| Real period: | $\Omega$ | ≈ | $0.56746904276629381945859994245$ |
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| Tamagawa product: | $\prod_{p}c_p$ | = | $ 64 $ = $ 2^{2}\cdot2^{2}\cdot2\cdot2 $ |
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| Torsion order: | $\#E(\Q)_{\mathrm{tor}}$ | = | $2$ |
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| Special value: | $ L^{(2)}(E,1)/2!$ | ≈ | $10.259903780147133121022575748 $ |
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| Analytic order of Ш: | Ш${}_{\mathrm{an}}$ | ≈ | $1$ (rounded) |
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BSD formula
$$\begin{aligned} 10.259903780 \approx L^{(2)}(E,1)/2! & \overset{?}{=} \frac{\# ะจ(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \\ & \approx \frac{1 \cdot 0.567469 \cdot 1.130007 \cdot 64}{2^2} \\ & \approx 10.259903780\end{aligned}$$
Modular invariants
Modular form 123840.2.a.j
For more coefficients, see the Downloads section to the right.
| Modular degree: | 270336 |
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| $ \Gamma_0(N) $-optimal: | no | |
| Manin constant: | 1 |
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Local data at primes of bad reduction
This elliptic curve is not semistable. There are 4 primes $p$ of bad reduction:
| $p$ | Tamagawa number | Kodaira symbol | Reduction type | Root number | $\mathrm{ord}_p(N)$ | $\mathrm{ord}_p(\Delta)$ | $\mathrm{ord}_p(\mathrm{den}(j))$ |
|---|---|---|---|---|---|---|---|
| $2$ | $4$ | $I_{5}^{*}$ | additive | 1 | 6 | 15 | 0 |
| $3$ | $4$ | $I_{3}^{*}$ | additive | -1 | 2 | 9 | 3 |
| $5$ | $2$ | $I_{2}$ | nonsplit multiplicative | 1 | 1 | 2 | 2 |
| $43$ | $2$ | $I_{2}$ | nonsplit multiplicative | 1 | 1 | 2 | 2 |
Galois representations
The $\ell$-adic Galois representation has maximal image for all primes $\ell$ except those listed in the table below.
| prime $\ell$ | mod-$\ell$ image | $\ell$-adic image |
|---|---|---|
| $2$ | 2B | 2.3.0.1 |
The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has level \( 5160 = 2^{3} \cdot 3 \cdot 5 \cdot 43 \), index $12$, genus $0$, and generators
$\left(\begin{array}{rr} 1 & 2 \\ 2 & 5 \end{array}\right),\left(\begin{array}{rr} 1 & 4 \\ 0 & 1 \end{array}\right),\left(\begin{array}{rr} 4561 & 4 \\ 3962 & 9 \end{array}\right),\left(\begin{array}{rr} 3097 & 4 \\ 1034 & 9 \end{array}\right),\left(\begin{array}{rr} 3442 & 1 \\ 3439 & 0 \end{array}\right),\left(\begin{array}{rr} 2 & 1 \\ 2579 & 0 \end{array}\right),\left(\begin{array}{rr} 4516 & 649 \\ 3225 & 1936 \end{array}\right),\left(\begin{array}{rr} 1 & 0 \\ 4 & 1 \end{array}\right),\left(\begin{array}{rr} 5157 & 4 \\ 5156 & 5 \end{array}\right),\left(\begin{array}{rr} 3 & 4 \\ 8 & 11 \end{array}\right)$.
The torsion field $K:=\Q(E[5160])$ is a degree-$9842652610560$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/5160\Z)$.
The table below list all primes $\ell$ for which the Serre invariants associated to the mod-$\ell$ Galois representation are exceptional.
| $\ell$ | Reduction type | Serre weight | Serre conductor |
|---|---|---|---|
| $2$ | additive | $4$ | \( 9 = 3^{2} \) |
| $3$ | additive | $2$ | \( 13760 = 2^{6} \cdot 5 \cdot 43 \) |
| $5$ | nonsplit multiplicative | $6$ | \( 24768 = 2^{6} \cdot 3^{2} \cdot 43 \) |
| $43$ | nonsplit multiplicative | $44$ | \( 2880 = 2^{6} \cdot 3^{2} \cdot 5 \) |
Isogenies
This curve has non-trivial cyclic isogenies of degree $d$ for $d=$
2.
Its isogeny class 123840.j
consists of 2 curves linked by isogenies of
degree 2.
Twists
The minimal quadratic twist of this elliptic curve is 20640.g1, its twist by $24$.
Growth of torsion in number fields
The number fields $K$ of degree less than 24 such that $E(K)_{\rm tors}$ is strictly larger than $E(\Q)_{\rm tors}$ $\cong \Z/{2}\Z$ are as follows:
| $[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
|---|---|---|---|
| $2$ | \(\Q(\sqrt{6}) \) | \(\Z/2\Z \oplus \Z/2\Z\) | not in database |
| $4$ | 4.0.4437600.1 | \(\Z/4\Z\) | not in database |
| $8$ | 8.0.11342761205760000.18 | \(\Z/2\Z \oplus \Z/4\Z\) | not in database |
| $8$ | deg 8 | \(\Z/2\Z \oplus \Z/4\Z\) | not in database |
| $8$ | deg 8 | \(\Z/6\Z\) | not in database |
| $16$ | deg 16 | \(\Z/8\Z\) | not in database |
| $16$ | deg 16 | \(\Z/2\Z \oplus \Z/6\Z\) | not in database |
We only show fields where the torsion growth is primitive. For fields not in the database, click on the degree shown to reveal the defining polynomial.
Iwasawa invariants
| $p$ | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | 41 | 43 | 47 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reduction type | add | add | nonsplit | ord | ss | ord | ord | ord | ss | ord | ss | ord | ord | nonsplit | ord |
| $\lambda$-invariant(s) | - | - | 2 | 2 | 2,2 | 4 | 2 | 2 | 2,2 | 2 | 2,2 | 2 | 2 | 2 | 2 |
| $\mu$-invariant(s) | - | - | 0 | 0 | 0,0 | 0 | 0 | 0 | 0,0 | 0 | 0,0 | 0 | 0 | 0 | 0 |
An entry - indicates that the invariants are not computed because the reduction is additive.
$p$-adic regulators
$p$-adic regulators are not yet computed for curves that are not $\Gamma_0$-optimal.